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Customer Communication


Changing ampere capacity

Q.
I would like to change the ampere capacity of my account. How much will this cost?
A.
Generally, when changing contracted ampere capacity between 10A and 60A, the only requirement is to replace the circuit breakers on the distribution board. There is no other special work required, and the replacement is free of charge. However, you must first check to see whether or not the breaker on the left-hand side of the distribution board is TEPCO-only circuit breaker: if it isn't, extra work is required. Please also note that in some cases ampere capacity cannot be increased beyond 60A because of internal wiring circumstances. Please consult with TEPCO in advance to make sure.

To apply for change in ampere capacity, or if you simply want to inquire about it, please call your local TEPCO Customer Center.
Q.
The contract says that ampere capacity can only be modified where TEPCO-only circuit breakers are in use. How can I tell whether my new place has TEPCO-only circuit breakers or not?
A.
TEPCO-only circuit breakers are marked in certain colors with the number of amperes followed by the letter "A." The colors and ampere numbers are as follows.

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Q.
I use an air-conditioner to cool my place in the summer and heat it in the winter so I would like to increase ampere capacity for those two seasons only. Can I do this?
A.
No, you can't. Electricity services agreements generally last for periods of one year and cannot be modified just for the seasons of highest use within those one-year periods.
Q.
What actually happens when a 20-ampere breaker is replaced with a 40-ampere one? Does it mean I use half as much electricity?
A.
The contracted ampere capacity is an indication of the volume of electricity that you can use at any one time. With a basic 20-ampere contract, you can use 100-volt electrical appliances to a total of 2,000 watts at any one time (for instance, you can use a 1,000 W microwave oven, a 700 W rice cooker, and a 300W vacuum cleaner). If you change to a 40-ampere contract, that total rises to 4,000 watts (meaning you could use, for instance, a 1,200W air-conditioner, a 1,500 W dryer, a 1,000 W microwave oven, and a 300 W vacuum cleaner).

In practice, if you use the same appliances in the same manner, then changing ampere capacity will not affect the volume of electricity used at all.

The ampere capacity you are contracted for also dictates the basic electricity charge. Specifically, this means 561.60 yen if you have a 20-ampere contract, 1,123.20yen if you have a 40-ampere contract.

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Q.
How much will my electricity bill change if I change ampere capacity?
A.
The change in electricity bill will be as follows. Please note there is no-change in the unit cost of the basic charge according to how much electricity you use.

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Q.
I'm not sure of the optimum level of ampere capacity for me. Could you please tell me?
A.
TEPCO is happy to advise you (free of charge) to ensure that you have the most suitable electricity services contract. The optimum ampere capacity depends on the kinds of electrical appliances used, as well as the manner in which you use them, so we will send our service staff to your place to check on such things before making any change. To book time with an advisor regarding ampere capacity, please call your local TEPCO Customer Center.
Q.
One of the small, black circuit breaker switches keeps breaking the circuit. If I increase ampere capacity will it stop doing this?
A.
That small, black circuit breaker switch is known as a "moulded-case circuit breaker'' or ''safety switch." It protects the wiring circuits in your house by shutting off certain circuits whenever surges of power above those circuits' capacities (i.e., 20 amperes per circuit) attempts to flow through the distribution board into the wires in one of the rooms in your house.

If a particular molded-case circuit breaker continually goes off, it is because that particular line is experiencing power surges. Increasing the ampere capacity would not prevent the safety switch from breaking the circuit if the same situation (power surge) kept arising. To ensure that a particular molded case circuit breaker does not keep going off, it is necessary to modify the wires concentrated in that particular part of your circuitry.

Our service staff would be happy to visit you and explain in detail. Please call your local TEPCO Customer Center.
Q.
I would like to change breakers to more than 60 amperes. How should I go about doing this?
A.
TEPCO-only circuit breakers are generally only available up to 60A. If you want to go above this, you will need to open a different kind of account. One of our service staff will need to go to your place and check your wiring. Please call your local TEPCO Customer Center.
Q.
I'm very busy on weekdays so I would like the TEPCO people to come and change the ampere capacity of my breakers on a weekend. Is this possible?
A.
Yes, it is. However, please note that we can only visit your place between 09:00 and 17:00.